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A/C Compressor superheat switch

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  • Jim
    #1

    A/C Compressor superheat switch

    I bought a remanufactured by GM A/C compressor (A-6) for my '73. Upon close inspection, there is no provision for a superheat switch in compressor. To the best of my knowledge, all of the Chevy A-6 compressors were the same. Was there a production change regarding this and if so when/why? Also, since a lead from the thermal fuse/limiter connects to this to guard against a high temp. low pressure condition, how is this guarded against if there is no superheat switch? Did GM make a retrofit low pressure switch or some other option to take its place? Even though the system will operate without the switch, I don't want to have a system "meltdown" one day. Any help would be appreciated. Thanks, Jim - Elkhart '73
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    • Jack H.
      Extremely Frequent Poster
      • April 1, 1990
      • 9906
      #2
      Re: A/C Compressor superheat switch

      The thermal protection system was added to A-6 in '72. Before that A-6 ran 'blindly' and you risked 'melt down'....
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        • Jack H.
          Extremely Frequent Poster
          • April 1, 1990
          • 9906
          #3
          Re: A/C Compressor superheat switch

          The thermal protection system was added to A-6 in '72. Before that A-6 ran 'blindly' and you risked 'melt down'....
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            • Jack H.
              Extremely Frequent Poster
              • April 1, 1990
              • 9906
              #4
              Tag line

              Curious, I thought AC-Delco rebuilds were the ONLY source you could trust for 'correct' matching of A-6 to application via part number. The other big rebuilders (NAPA, Etc.) are known to simply inter-mix passenger car configurations (12.6 cu in displacement vs. Corvette's unique 10.8 cu in displacement, note also used on other 'Chevy A/C' systems vs. Four Seasons -- read this truck and/or dealer underdash installs) and early/late style A-6 under a common application part number....
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                • Jack H.
                  Extremely Frequent Poster
                  • April 1, 1990
                  • 9906
                  #5
                  Tag line

                  Curious, I thought AC-Delco rebuilds were the ONLY source you could trust for 'correct' matching of A-6 to application via part number. The other big rebuilders (NAPA, Etc.) are known to simply inter-mix passenger car configurations (12.6 cu in displacement vs. Corvette's unique 10.8 cu in displacement, note also used on other 'Chevy A/C' systems vs. Four Seasons -- read this truck and/or dealer underdash installs) and early/late style A-6 under a common application part number....
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